Dynamic fracture and frictional heating due to periodic excitation in energetic materials
Abstract
Mechanical stimulus may lead to localized temperature increase due to the concentration of energy dissipation at microstructural features. Mechanically induced heating occurs, for example, when materials are subjected to periodic excitation. This is a particular concern in energetic materials where ignition may start a deflagration. In this study, finite element simulations are performed on a single β-HMX particle in a polymer matrix subjected to mechanical periodic excitation. Different initial defects, such as cracks and interface debonding, are included to control the location of hot-spots nucleation. The model accounts for damage evolution and heat generation due to friction at cracks. The results indicate that hot-spots nucleate preferentially at the particle/binder interface, and therefore, the temperature rate is higher when the particle is initially debonded than when it is perfectly attached to the polymer.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 28, 2018
- Source ID
- 10.1063/1.5048723
Entities
People
- Camilo A. Duarte
- Marisol Koslowski
- Rachel Kohler
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Division of Engineering Education & Centers
- Liberty University
- Office of Naval Research Global
- Purdue University